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Thomas Edison was born on February 11,1847. His siblings died at a young age and he was one of the only four to make it to adulthood.He didn't get much formal schooling, and began working on a railroad.

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In 1878, Edison focused on inventing a safe, inexpensive electric light to replace the gaslight.He made a breakthrough in October 1879 with a bulb that used a platinum filament, and in the summer of 1880 hit on carbonized bamboo as a viable alternative for the filament, which proved to be the key to a long-lasting and affordable light bulb.

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Benjamin Franklin was born on January 17, 1706. Franklin was the eighth of Abiah and Josiah’s(his parents)10 offspring.Franklin’s formal education was limited and ended when he was 10, however, he was an avid reader and taught himself to become a skilled writer.

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In the 1740s, he conducted experiments that contributed to the understanding of electricity, and invented the lightning rod, which protected buildings from fires caused by lightning. In 1752, he conducted his famous kite experiment and demonstrated that lightning is electricity. Franklin also coined a number of electricity-related terms, including battery, charge and conductor.

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Martin Cooper was the first born of Mary Cooper and Arthur Cooper, born on the 26th of December, 1928, during the Great Depression in Chicago.They made modest living, selling merchandise door-to-door.

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Martin needed an extensive knowledge of electricity to create a mobile phone. Mobile phones have many circuits, wires, and many other pieces of electricity.

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Nikola Tesla was born in 1856 in Smiljan, Croatia. In  1863 Tesla’s brother Daniel was killed in a riding accident. The shock of the loss unsettled the 7-year-old Tesla, who reported seeing visions—the first signs of his lifelong mental illnesses.

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In the 1890s Tesla invented electric oscillators, meters, improved lights and the high-voltage transformer known as the Tesla coil. He also experimented with X-rays, gave short-range demonstrations of radio communication.

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Bell was born on March 3, 1847 in Edinburgh, Scotland, the second born son of Alexander Melville Bell. While not the best student, Bell had an uncanny talent for problem solving. At 12 years old, he invented a farming device for his friend’s father that quickly and efficiently removed the husks from wheat grain.

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On March 7, 1876, Bell was awarded a patent on the telephone, and three days later, he made his first successful telephone call to his assistant, electrician Thomas Watson, who would hear Bell’s famous words transmitted through the wire: “Mr. Watson, come here. I want you.” The message was sent along an electronic telegraph wire.

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https://www.history.com/
https://www.britannica.com/biography/Martin-Cooper